Fireless cooker and heater



Oct. 27, 1925. 1,559,337

M. J. MCFARLANE FIRELESS COOKER AND HEATER @al a@ WM *M Oct. 27, 1925. 1,559,337

Y M. J. MCFARLANE FIRELESS COOKER AND HEATER Filed June '7I 1924 2 Sheets-Sheet 2 a@ i 40 l i V1 f4. I 5 lli 5 4f gnuemtoz 61H01 uuid.

Patented Oct. 27, 1925.

MALCOLM J. MCFARLANE, NEW ORLEANS, LOUISIANA.

FIRELESS COOKER AND HEATER.

Application tiled .Tune 7,

10- aZZ whom, t 'may concern:

Be it known that I, Marcom J. Molhxn- LANE, a citizen ot the United States. residing' at New Orleans, in the parish of O1'- leans and State of Louisiana., have invented certain new and useful Improvements in Fireless Cookers and Heaters; and I do hereby declare the following` to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present inventionrclates to improvements in lireless cookers and heaters, and has for an object to provide an improved device for use with either electricity or gas and adapted to be made in either single or multiple compartments.

It is another object ot the invention .to provide an inexpensive toi-m of construction of tireless cooker and heater in which the heat will be more ell'cctively retained against escape by radiation whereby to secure a greater economy in operation.

Further objects ot the yinvention are to construct a device of this character in which the component materials will be cheap. wherein the manufacture may be conducted bv simple methods and few operations and in which the resultant product will he coinpact, light and easily accessible to all iiiterior parts.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will bev more particularly pointed out in the claims appended hereto.

In the drawings, wherein lile symbols rcer to like .or corresponding parts throughout the several views.

Figure' l is a front elevation showing' a duplex cooker and heater constructed according to the present invention.

Figure 2 is a fragmentary section italien vertically therethrough.

Figure 3 is a vertical sec( ion taken at substantially right angles to Figure 2;

Figure tis a cross section through one of the compartments, and

Figure 5 is a front elevation of the single device.

Referring more particularly to the drawings the device is contained in anv outer casing-6 of metal, referably a lightrelative- 1y thin sheet meta which lends itself readi- 1924. Serial No. 718,639.

ly to the cylindrical or other formation usually given devicesot' this kind. This casing (i is provided with doors 'i' and 8 hinged at one side as indicated at i) and lt-l and provided at the front edges with pivoted latches l1 adapted to engage with the keepers 12 upon the casing adjacent the door openings. The cylindrical casing is adapted to stand on end and the doors ai'e made in the side walls thereof, the doors contorniing to the general shape of the casing and being wide and substantially high, so as, to give ready and convenient access to the interior chambers 13 and 14 for the purpose of placing and removing pots, kettles and other containers in'ivhieh the food stuff or other material to be cooked is placed. One of these containers is shown at l5 in the lower compartment in Figure 3. The container is seated upon a stone 16 which is placed above the heating elements as later explained, the stone absorbing the heat given ed by the heating elements and retaining this heat for along time after the heating clement has been turned oli'. This absorbed heat is radiated throughout the chamber or cooker and the heat is retained Jfrom radiation by the walls 17.

These Walls are preferably otvitro-asbestos approximately one and one-halt' inches thick and constitute a lining within the inetal casing 6. At the base ot the casing is a bottoni wall 18 also of non-conducting material which may be molded or otherwise i'ormed in one piece with the side wall 17. The bottom wall 18 is provided with a central depression 19 adapted to receive the gas burner 20-lying beneath the upper surface of the wall 18 and provided with a mixture ot' gas and supporting` oxygen from a pipe entering through the side wall ot the casing 6 as indicated in Figure 4. This bottom wall 1S is also provided with :i serpentine groove 22 `for receiving a continuons electric resistance coil 23 looped about in the groove and extending beneath the upper surface of the bottom wall 18 and beneath a large surface area of the stone 16.

The electrical connections are brought in at one side as indicated in Figures 3 and 4.

There is a division Waller partition 2l between the upper and'flower compartments 13' and 14. this wall being also of appropriate non-conducting material and being preferably molded one with the side wall `1'? f which extends common to both Vcompartfthe casing 6..'

25 vto receivehthe upper. edgely'ing of 'the partition,

and in this partition is formed with also a similar serpentine groove 27 for re- \conncctionsv Vfor which branch vlinesand va master switch 32 beingplaced inthe main line.

'lowercoil r I L The-same arrangement is possiblefor the ceiving an electric resistance coil 28, the .may -join with the llead wires to a lower coil as indicatedat 29, switch buttons 30 and 31 being placed in the permits. thejenergizing ofeither upper or individually.

gas burners, the main supply pipe to which is indicated at 33 in Figure 1, the two burn- .put on and'secur 35 ers 'being supplied independently by the branch pipes 34 and -35 each aving valves 36 and 37l therein for' independent opera. tion.-

In manufacturing the device, thecasing 6 is made independently of course from the liner and this liner is uilt up by molding orotherwise in a composite whole including the top wall 38. The 'top wall 39 of the outer casing 6 is, however, not originally attached to the casing, -the casing being open from above so that the liner maybe slid down therein. After the lining is in place, the cover 39 is as by brazing or spot-4 4welding', the joint being afterwards suitably vfinished or smoothed so as yto give the ap 4earance of continuity. 8f course the door'openings are originally leftfin the liner and the flanges 40' are not originallyabout the door openings pressed in. This operation 'is' conducted after the liner is in place and the flanges 4Q are preferably on an incline as shown in Figure 3. Suchianges serve to sustain the liner at appropriate points and the flanges above and .below the partition -24 materially assist to reinforce and str'en struction at this point, but t self ossesses substantial body and 1n devices" that have already it is found that no additional vremforcement is. necessaryf and strength and 8 are also provided'witli and inclined mutually thereto, so thatthe doors may close with a tight tit. The dissipation of heat throu 41 is found tor be egl1gible.

In Figure there is shown a single heater containing only `one chamber'but the parts are identical in 'the lower compartment of the'double constructionalready described and except that 1 there is no partition. and associated parts,

this `device is in all respects "similar in con- The arrangement thereof, suchl changes ing restricted only by been built.

in its upper side a centrally disposed'c gh the 'flanges 40 and .resistance coil this case with for instancevr and lower door openings 1n Luc/9,887

double form of the invention already referred to. In the use of the device eitherfthe gas burner Vis lighted or the electric coil ener-v gized and the containers'l directlyheated by placing them upon' vthe bottom wall 18 of the partition 24 or-b'yplacing these containers upon the 'stone comesV highly -heated and?y absorbs great quantity, of heat which-it afterwards continues to give off for a long period of -time after which the gas burner is andthe electric heating coil deenergized. It is at times desirable to Aenergize coil and also light the burner. The direct application of the to the stone enables the latter to acquire a high-heat and this application centrally of the stone enables thel heat to be absorbed substantially equally in all'directions. The heat from the'electric coil is of a milder form yet extending simultaneously to all 16. f'The stone bef the extinguished flame from the gas burner However, theheat is acquired by 4the outer edges of the stone possibly more quickly by the use of the resistance coil m the position stated and a high heat is rapidly. absorbed by the stone with the use of the one i rm of heating enables a saving from'a more prolonged application of heat fromthe other heating medium.A 'Either upper or lower compartment may be put in operation independently of the other.

lltI is obvious that various changes and modifications may be made in the details o f constructionand design of the above specilically described-embodiment of this 1nboth heated elements 'so that the economy 1n ventionwithout departing from the spirit the scope of the following claims. v v What laimed isz-r 1. A `tireless cooker and heater compris-- ing a thin metallic casing, a liner fitting in the casing and including integral side,top and bottomv walls,

and a serpentine groove thereabout,

'seated-in the cavity, means housed inthe liner and extending in `the casing for supplying fuel to the gas burner, and an electrlc alu-external source of energyf.

said bottom wall v having -seated in said groove and 'connected through the hner and casing to and modilications be- 1' 2. Afirelesscooker and heater comprising a thin metallic casinghaving its sides, oors for closing said openings, a composite insulating liner fitting in said casing and havseparate u per avitiy; bot said cavity-and groove opening through the ing integral top, bottom and an intermediate fuel to said burners, anelectric resistance partition walls providing upper and lower coil in -each serpentine groove, and an ex- 10 compartments, said partition and bottom terna] connection from a source of electric Walls each having a central cavity and a energy to said coils, whereby said compartserpentine groove opening respectively ments may be independently and simultathrough the" upper faces of the partition and neously used as fireless cookers and heaters. bottom Walls, a gas burner in each cavity, f

a connection from an external source of MALCOLM J. MFARLANE. 

